Re: Add function to rotate/transpose all windows

[martin rudalics]

I now rewrote 'split-window' and 'split-window-internal' and attach the
new versions.  I don't mention "dead windows" in docs and error messages
any more.  I can't use "leaf windows" because that is nowhere specified
(with one exception in E.9.2 the Elisp manual talks about "leaf nodes"
only).  Internal windows OTOH are mentioned because they are defined and
frequently used in the manual.  Please have a look.

ChangeLog is below, a NEWS entry will be added later.

martin

Let 'split-window' optionally reuse dead window instead of making new one

* lisp/window.el (split-window): New argument REFER to reuse dead
window instead of making a new one.
* src/window.c (Fwindow_old_buffer): Make it work for any window
including deleted ones.  In doc-string say that for a deleted
window it returns the buffer the window had at the time it was
deleted.
(make_parent_window): Reset old_buffer slot installed by memcpy.
(Fsplit_window_internal): Handle new argument REFER inherited
from 'split-window'.
(Fdelete_window_internal, delete_all_child_windows): Set
old_buffer slot of the window to delete to the window's buffer.
* doc/lispref/windows.texi (Splitting Windows): Describe new
argument REFER.
(Window Hooks): Mention that for a dead window 'window-old-buffer'
returns the buffer the window had when it was deleted.

split-window.diff
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